Current version of ATX12V 2.x power supply provides two connectors for the motherboard: a 4-pin auxiliary connector providing additional power to the CPU, and a main 24-pin ATX 2 power supply connector, an extension of the original 20-pin version. Originally the motherboard was powered by one 20-pin connector. A −5 V output was originally required because it was supplied on the ISA bus, but it became obsolete with the removal of the ISA bus in modern PCs and has been removed in later versions of the ATX standard. Low-power −12 V (☑.2 V) and 5 VSB (standby) (☐.25 V) supplies are also required. The ATX specification requires the power supply to produce three main outputs, +3.3 V (☐.165 V), +5 V (☐.25 V) and +12 V (☐.60 V). Nowdays this standard is obsolete and superseeded by ATX 2.2 (24 pin). In addition to the old AT standard, ATX 2.0 has one extra voltage line available (+3.3V), a connector chain-lined to the single 20-pin and a power-on wire that allows Software to turn off the PSU. ATX specification includes not only Power Supply Unit, but also interface to case and motherboard.
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